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- W2035581623 abstract "Young stars with masses 2-8 Suns, called the Herbig Ae and Be stars, often show a near-infrared excess too large to explain with a hydrostatically-supported circumstellar disk of gas and dust. At the same time the accretion flow carrying the circumstellar gas to the star is thought to be driven by magneto-rotational turbulence, which according to numerical MHD modeling yields an extended low-density atmosphere supported by the magnetic fields. We demonstrate that the base of the atmosphere can be optically-thick to the starlight and that the parts lying near 1 AU are tall enough to double the fraction of the stellar luminosity reprocessed into the near-infrared. We generate synthetic spectral energy distributions (SEDs) using Monte Carlo radiative transfer calculations with opacities for sub-micron silicate and carbonaceous grains. The synthetic SEDs closely follow the median Herbig SED constructed recently by Mulders and Dominik, and in particular match the large near-infrared flux, provided the grains have a mass fraction close to interstellar near the disk's inner rim." @default.
- W2035581623 created "2016-06-24" @default.
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- W2035581623 date "2013-12-11" @default.
- W2035581623 modified "2023-09-30" @default.
- W2035581623 title "HERBIG STARS' NEAR-INFRARED EXCESS: AN ORIGIN IN THE PROTOSTELLAR DISK'S MAGNETICALLY SUPPORTED ATMOSPHERE" @default.
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- W2035581623 doi "https://doi.org/10.1088/0004-637x/780/1/42" @default.
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